Yes, I noticed that my daughter's delta account would expire this December so I switched a credit card to her account and ate at a restaurant. Did the same with my account even though I had til next year - this way the expiration will be the same and easier to remember. She only has 7122 - but why lose them. I have 108K and definitely don't want to lose them. You never know when aa won't come through with availability and Delta will. Most of my miles were from MCI and and AMEX credit card promotions.